EP0999655A3 - Verfahren zur Bestimmung eines Echokopplungsfaktors und der Echolaufzeit in einem bidirektionalen Telekommunikationssystem - Google Patents

Verfahren zur Bestimmung eines Echokopplungsfaktors und der Echolaufzeit in einem bidirektionalen Telekommunikationssystem Download PDF

Info

Publication number
EP0999655A3
EP0999655A3 EP99440283A EP99440283A EP0999655A3 EP 0999655 A3 EP0999655 A3 EP 0999655A3 EP 99440283 A EP99440283 A EP 99440283A EP 99440283 A EP99440283 A EP 99440283A EP 0999655 A3 EP0999655 A3 EP 0999655A3
Authority
EP
European Patent Office
Prior art keywords
coupling factor
determining
propagation delay
telecommunication system
echo coupling
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP99440283A
Other languages
English (en)
French (fr)
Other versions
EP0999655A2 (de
EP0999655B1 (de
Inventor
Michael Walker
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alcatel Lucent SAS
Original Assignee
Alcatel CIT SA
Alcatel SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alcatel CIT SA, Alcatel SA filed Critical Alcatel CIT SA
Publication of EP0999655A2 publication Critical patent/EP0999655A2/de
Publication of EP0999655A3 publication Critical patent/EP0999655A3/de
Application granted granted Critical
Publication of EP0999655B1 publication Critical patent/EP0999655B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other
    • H04B3/23—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other using a replica of transmitted signal in the time domain, e.g. echo cancellers

Abstract

Um in bidirektionalen Telekommunikationssystemen, die beispielsweise 2 Draht/4 Draht-Wandler und /oder AD/DA Wandler und/oder Satellitenübertragungsstrecken enthalten die auftretenden Echos erfolgreich kompensieren zu können, müssen für ein System der Echokopplungsfaktor und die Echolaufzeit sehr genau und unabhängig beispielsweise von der Gegensprechsituation bestimmt werden. Erfindungsgemäß wird dazu ein Verfahren angegeben, bei dem durch Analyse eines Dialogs Zustände und Zeitabschnitte ermittelt werden, in denen die Wahrscheinlichkeit der Fehlschätzung des Kopplungsfaktors zwischen den Übedragungspfaden und der Echolaufzeit sehr gering ist. Zur Verbesserung der Meßgenauigkeit werden Hilfsgrößen eingeführt, die von der Sprachdynamik und vom Verlauf des Sprachsignals abhängig sind.
EP99440283A 1998-10-31 1999-10-22 Verfahren zur Bestimmung eines Echokopplungsfaktors und der Echolaufzeit in einem bidirektionalen Telekommunikationssystem Expired - Lifetime EP0999655B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19850271A DE19850271A1 (de) 1998-10-31 1998-10-31 Verfahren zur Bestimmung eines Echokopplungsfaktors und der Echolaufzeit in einem bidirektionalen Telekommunikationssystem
DE19850271 1998-10-31

Publications (3)

Publication Number Publication Date
EP0999655A2 EP0999655A2 (de) 2000-05-10
EP0999655A3 true EP0999655A3 (de) 2001-12-05
EP0999655B1 EP0999655B1 (de) 2006-08-02

Family

ID=7886286

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99440283A Expired - Lifetime EP0999655B1 (de) 1998-10-31 1999-10-22 Verfahren zur Bestimmung eines Echokopplungsfaktors und der Echolaufzeit in einem bidirektionalen Telekommunikationssystem

Country Status (7)

Country Link
US (1) US6459789B1 (de)
EP (1) EP0999655B1 (de)
JP (1) JP2000151475A (de)
AT (1) ATE335314T1 (de)
AU (1) AU5712399A (de)
CA (1) CA2285803A1 (de)
DE (2) DE19850271A1 (de)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0604870A2 (de) * 1992-12-18 1994-07-06 Nec Corporation Anordnung zur Feststellung der Anwesenheit von Sprachsignalen zur Regelung eines Echokompensators
US5570423A (en) * 1994-08-25 1996-10-29 Alcatel N.V. Method of providing adaptive echo cancellation

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4229910A1 (de) * 1992-09-08 1994-03-10 Sel Alcatel Ag Verfahren zum Verbessern der akustischen Rückhördämpfung von elektroakustischen Anlagen
CA2102857C (en) * 1992-12-31 1998-06-23 Alexander Feiner Technique for reducing echoes in conference communications
DE4305256A1 (de) * 1993-02-20 1994-08-25 Sel Alcatel Ag Verfahren zum Verbessern der akustischen Rückhördämpfung von elektroakustischen Anlagen
US5535194A (en) * 1994-07-14 1996-07-09 Motorola, Inc. Method and apparatus for echo canceling with double-talk immunity
DE19517469A1 (de) * 1995-05-12 1996-11-14 Sel Alcatel Ag Freisprechverfahren für ein mehrkanaliges Übertragungssystem
US5631900A (en) * 1995-09-29 1997-05-20 Crystal Semiconductor Double-Talk detector for echo canceller
DE19543666A1 (de) * 1995-11-23 1997-05-28 Sel Alcatel Ag Echokompensator
US5920548A (en) * 1996-10-01 1999-07-06 Telefonaktiebolaget L M Ericsson Echo path delay estimation
DE19714966C2 (de) * 1997-04-10 1999-04-01 Siemens Ag Vorrichtung zur Rückhördämpfung
JP3597671B2 (ja) * 1997-05-16 2004-12-08 三菱電機株式会社 ハンズフリー電話機
US6212273B1 (en) * 1998-03-20 2001-04-03 Crystal Semiconductor Corporation Full-duplex speakerphone circuit including a control interface

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0604870A2 (de) * 1992-12-18 1994-07-06 Nec Corporation Anordnung zur Feststellung der Anwesenheit von Sprachsignalen zur Regelung eines Echokompensators
US5570423A (en) * 1994-08-25 1996-10-29 Alcatel N.V. Method of providing adaptive echo cancellation

Also Published As

Publication number Publication date
DE59913726D1 (de) 2006-09-14
DE19850271A1 (de) 2000-05-04
AU5712399A (en) 2000-05-04
JP2000151475A (ja) 2000-05-30
EP0999655A2 (de) 2000-05-10
EP0999655B1 (de) 2006-08-02
CA2285803A1 (en) 2000-04-30
US6459789B1 (en) 2002-10-01
ATE335314T1 (de) 2006-08-15

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